WO2023244126A1 - Procédé de culture d'un crustacé - Google Patents

Procédé de culture d'un crustacé Download PDF

Info

Publication number
WO2023244126A1
WO2023244126A1 PCT/NZ2023/050039 NZ2023050039W WO2023244126A1 WO 2023244126 A1 WO2023244126 A1 WO 2023244126A1 NZ 2023050039 W NZ2023050039 W NZ 2023050039W WO 2023244126 A1 WO2023244126 A1 WO 2023244126A1
Authority
WO
WIPO (PCT)
Prior art keywords
shell
ledge
shellfish
oyster
tab
Prior art date
Application number
PCT/NZ2023/050039
Other languages
English (en)
Inventor
Shaun Gregory
Original Assignee
Aqua Mould Systems Nz Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aqua Mould Systems Nz Limited filed Critical Aqua Mould Systems Nz Limited
Publication of WO2023244126A1 publication Critical patent/WO2023244126A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K61/00—Culture of aquatic animals
    • A01K61/50—Culture of aquatic animals of shellfish
    • A01K61/54—Culture of aquatic animals of shellfish of bivalves, e.g. oysters or mussels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81—Aquaculture, e.g. of fish

Definitions

  • This invention relates to a method of growing a shellfish, for example an oyster, in a manner that facilitates opening of its shell.
  • Shellfish for example oysters
  • the fleshy edible part of a shellfish grows inside a shell and to get to this one must first prise the shell open. This can be difficult and time consuming because significant force must typically be applied to open the shell, and to open a large number of shells efficiently takes a reasonable expertise.
  • the invention is a method of growing a shellfish, comprising causing the shellfish to develop in or on a substrate such that an edge of its shell forms a tab that protrudes proud of the rest of the shell, the tab being such that it can be cut through without cutting any other parts of the shell to create an aperture which is sufficient to receive a blade that can be manipulated by hand to cut through the shellfish’s abductor muscle.
  • the substrate comprises a tab-forming walled ledge which delineates the shape and position of the tab, and the shellfish’s shell grows into the ledge to create the tab.
  • the ledge extends outwards as a discontinuity in a convex side of the substrate.
  • the substrate comprises a cup and a plurality of fingers, wherein the fingers extend at an angle upwards and inwards from a top edge of the cup, the fingers serving to encourage the shell to grow in a predetermined shape.
  • the tab is such that when fully formed it can be cut by hand tool to create the aperture.
  • the shellfish is an oyster.
  • the substrate comprises a mould.
  • the tab is adjacent to the shellfish’s abductor muscle.
  • a method of opening a shellfish comprising the steps of: a) obtaining a shellfish grown according to a method as above; b) using a cutting tool to cut through the tab so that the aperture is created; c) inserting a blade into the shell via the aperture and causing it to move to severe the shellfish’s abductor muscle so that the muscle provides no, or substantially no, resistance to opening of the shell; and d) opening the shell to provide access to edible flesh within the shell.
  • a substrate for use in shaping a growing oyster comprising a cup suitable for receiving an oyster spat, a side wall of the substrate having a walled ledge cantilevering outwards as a discontinuity in the side wall, the ledge being open to the interior of the substrate, the substrate being such that in the event a spat is placed in or on it the spat can be left to grow so that the shell of the oyster grows into the ledge to produce a tab of complimentary shape to the ledge which, if cut through, exposes an aperture sufficiently close to the oyster’s adductor muscle such that a blade can be inserted in the aperture and manoeuvred to sever the muscle.
  • the substrate has a developing oyster therein with part of the shell of the oyster having formed in the ledge.
  • the substrate is in the form of a mould.
  • the ledge cantilevers as a discontinuity of a convex portion of the cup.
  • Figure 1 is an overview view of a known type of oyster
  • Figure 2 is an isometric view of a mould for growing oysters in according to the invention
  • Figure 3 is an isometric view of an oyster grown in the mould
  • Figure 4 is an isometric view of the oyster of Figure 3, when cut to expose an aperture
  • Figure 5 is an overhead cross-sectional view of the oyster of Figure 4 just prior to having its abductor muscle cut;
  • Figure 6 is an isometric view of the oyster of Figure 5 when it’s shell has been opened.
  • Figure 7 is an isometric view of a blade used to sever the abductor muscle.
  • Figure 1 illustrates standard type of mature oyster 1 prior to being opened for consumption.
  • the oyster’s shell comprises a pair of cups 2, 3 that are held tight together by the oyster’s abductor muscle inside the shell.
  • the position and shape of the abductor muscle is indicated with broken lines at 4.
  • To open the shell the abductor muscle must be severed, and this is traditionally achieved by forcing a shucking knife between the two cups and manoeuvring it to slice through the muscle. The process tends to require a fair amount of skill of done without undesirably cutting through and spoiling the marketability of the edible fleshy parts of the oyster inside the shell.
  • an oyster is placed in a mould 5 when at the spat stage of its life, and is left there to mature.
  • the mould is open topped and shaped to encourage the oyster’s shell to form in an aesthetically pleasing shape complimentary to the interior of the mould.
  • a series of fingers 6 angle upwards and inwards from the cup’s upper peripheral edge 7. These also assist to encourage the oyster to grow into the desired shape.
  • a sidewall of the mould has a ledge 8 that juts outwards as a discontinuity from the surrounding convex shape of the mould.
  • the oyster develops, its shell grows against the walls of the mould and into the ledge 8, the outer part of which comprises a wall 8a.
  • the portion of the oyster’s shell that grows into the ledge presents as a tab 9 when the oyster is mature and is removed from the mould.
  • an elongate blade 11 is then inserted into the aperture 10 by hand so that it is positioned immediately next to the abductor muscle 12. From there the blade is moved laterally by hand, for example pivoted against one side 13 of the aperture, to sever the abductor muscle.
  • Figure 7 illustrates the blade 11 alone. It has a hand grip 15 and two sharp edges 16 and 17. In some embodiments the blade may be sharp at only one of its edges 16, 17.
  • the mould 5 has one or more plate like flanges 18 around the edge 7 of the cup and these serve to hold the oyster in a tray of multiple of the moulds, each with a growing oyster inside.
  • the ledge may be approximately 23 mm long and 6 mm deep. In other embodiments, the ledge may be approximately 15 mm long and approximately 12 mm deep. In each case the tab forms to about those dimensions.
  • the embodiments described above allow for an oyster to be opened in a relatively straight forward easy manner soon before it is needed for consumption.
  • the tab 9 is part of the shell, the oyster flesh is more amendable to remaining sealed against decay compared, for example, to a situation where the shell is cut to expose an aperture while the oyster is growing, or significantly before it is consumed, and an artificial tab inserted into the aperture to plug it.
  • having the oyster grow its own tab for later cutting means that it requires less processing compared to a situation where an artificial plugging tab is inserted.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Marine Sciences & Fisheries (AREA)
  • Zoology (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Processing Of Meat And Fish (AREA)
  • Meat, Egg Or Seafood Products (AREA)

Abstract

L'invention concerne un procédé de culture d'un crustacé, comprenant les étapes consistant à amener le crustacé à se développer dans ou sur un substrat de telle sorte qu'un bord de sa coque forme une languette (9) qui fait saillie du reste de la coque, la languette étant telle qu'elle peut être coupée sans couper d'autres parties de la coque pour créer une ouverture (10) qui est suffisante pour recevoir une lame (11) pouvant être manipulée à la main pour sectionner le muscle abducteur du crustacé.
PCT/NZ2023/050039 2022-06-17 2023-03-29 Procédé de culture d'un crustacé WO2023244126A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2022204231 2022-06-17
AU2022204231A AU2022204231B1 (en) 2022-06-17 2022-06-17 A Method of Growing a Shellfish

Publications (1)

Publication Number Publication Date
WO2023244126A1 true WO2023244126A1 (fr) 2023-12-21

Family

ID=84388133

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ2023/050039 WO2023244126A1 (fr) 2022-06-17 2023-03-29 Procédé de culture d'un crustacé

Country Status (2)

Country Link
AU (1) AU2022204231B1 (fr)
WO (1) WO2023244126A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5579724A (en) * 1994-07-25 1996-12-03 Chauvin; Leroy J. Oyster holder for oyster growing system
WO2002085108A1 (fr) * 2001-04-23 2002-10-31 Jacques Fesquet Dispositif d'elevage en milieu aquatique de coquillages bivalves telles que les huitres
FR2959394A1 (fr) * 2010-04-28 2011-11-04 Cambon Et Fils Procede d'elevage des huitres et dispositif pour sa mise en oeuvre

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5579724A (en) * 1994-07-25 1996-12-03 Chauvin; Leroy J. Oyster holder for oyster growing system
WO2002085108A1 (fr) * 2001-04-23 2002-10-31 Jacques Fesquet Dispositif d'elevage en milieu aquatique de coquillages bivalves telles que les huitres
FR2959394A1 (fr) * 2010-04-28 2011-11-04 Cambon Et Fils Procede d'elevage des huitres et dispositif pour sa mise en oeuvre

Also Published As

Publication number Publication date
AU2022204231B1 (en) 2022-12-08

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